Arm chair



FIG. 1 is a top plan view of an arm chair embodying my design;

FIG. 2 is a front elevation of the arm chair of FIG. 1;

FIG. 3 is a side elevation of the arm chair of FIGS. 1 and 2; and

FIG. 4 is a back elevation of the arm chair of FIGS. 1 to 3.

The side of the chair not shown in FIG. 3 is a mirror image of the side shown. 

The ornamental design for an arm chair, as shown and described. 